ICP-OES法测定钛合金中Al元素含量的不确定度评定

Uncertainty Evaluation of Aluminum Content in Titanium Alloys by ICP- OES

将钛合金样品用10 mL 1∶1硫酸溶解后,用ICP-OES法对其中Al元素含量进行测定,测得样品中w(Al)=6.91%。对测定过程中的不确定度来源进行了分析,依据不确定度评定的步骤,计算得到了各分量标准不确定度及合成标准不确定度,w(Al)测定结果的扩展不确定度为U=0.17%,K=2。

Dissolve titanium alloy with 10 ml 1 ： 1 sulphuric acid, analysis w（A1） by ICP -OES, the result was w（A1） = 6.91%. The sources of uncertainty were analyzed. According to the process of the standard uncertainty evaluation, the standard uncertainty of components and the composed standard uncertainty were calculated, and U（wA1） = 0. 17%, K=2.